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Why should the Odra River mouth area not be regarded as an estuary? A geologist’s point of view

Osadczuk A., Musielak S., Borówka R.K.

Oceanological and Hydrobiological Studies

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2007

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Vol. 36, No.2

87-99

EN

The authors find no arguments that would justify application of the term “estuary” to the area of the Odra River discharge into the Baltic Sea. The physiography, geology, and hydrology of the Odra river mouth show that the area possesses many more characteristics typical of flow-through coastal lagoons than those of estuaries. Of key importance in this respect is the Szczecin Lagoon, an extensive, shallow water body separated from the open sea by a barrier intersected by three narrow and long straits. The lagoonal nature of the area is demonstrated also by its geological history.

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Palaeoenvironmental changes in the area of the Szczecin Lagoon (the south western Baltic Sea) as recorded from diatoms

Witkowski A., Latałowa M., Borówka R., Gregorowicz P., Bąk M., Osadczuk A., Święta J., Lutyńska M., Wawrzyniak-Wydrowska B., Woziński R.

Studia Quaternaria

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2004

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Vol. 21

153-165

EN

Analyses of diatom assemblages were performed in sediment cores from the Szczecin Lagoon area, as a part of a multidisciplinary research including seismoacoustic profiling and different types of palaeoecological and geological analyses: palynological, macrofossil, malacological, lithological, geochemical and sedimentological. Changes in the composition of a large spectrum of species of the local fauna and flora allowed the reconstruction of environmental conditions during the Late Glacial and Holocene in the Szczecin Lagoon. Succession of the diatom communities is the main topic of the present paper. In the Late Glacial sediments, the diatom flora was scarce and occurred only in core 42/99. In other cores, diatom assemblages characteristic for three phases of the Holocene development (limnic-swampy, marine/brackish-water and lagoonary) of the Szczecin Lagoon were distinguished. The Late Glacial (Older-Dryas (?), Allerod and Younger Dryas) record is incomplete and the flora is predominantly represented by Actinocyclus normanii, Aulacoseira spp, Cocconeis placentula, and Fragilaria brevistriata. The oldest Holocene sediments of the limnic-swampy type, are characterised by freshwater and halophilous diatoms (e.g. Fragilaria brevistriata, Cocconeis placentula and Stephanodiscus hantzschii). In the overlying marine sediments, only occasionally brackish-water taxa (e.g. Planothidium delicatulum, Cocconeis hauniensis) were observed. In the uppermost deposits formed in lagoonary conditions freshwater, halophilous and brackish-water species dominated (e.g. Aulacoseira granulata, Cavinula scutelloides and Epithemia turgida).

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Cechy geologiczne środowisk estuariów i lagun

Osadczuk A.

Zeszyty Naukowe. Marine Sciences / Uniwersytet Szczeciński

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1999

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Nr 5

95-133

EN

Estuaries and lagoons are specific geological environments existing on contact of the land and the sea. There are many definitions and classifications of these environments, which depend on point of view of different research disciplines. Such situation causes a lot of disagreements between specialists such domains as hydrology, geology, geomorphology, etc. Author's intention was to compile and compare of various data about these transitional geological environments. Some information were compiled regarding definitions, classifications and such geological features as hydrodynamics, lithodynamics, sedimentary processes and geochemistry of sediments of estuaries and lagoons.

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Cechy geologiczne środowisk estuariów i lagun

Osadczuk A.

Zeszyty Naukowe. Marine Sciences / Uniwersytet Szczeciński

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1998

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Nr 5

95-133

EN

Estuaries and lagoons are specific geological environments existing on contact of the land and the sea. There are many definitions and classifications of these environments, which depend on point of view of different research disciplines. Such situation causes a lot of disagreements between specialists such domains as hydrology, geology, geomorphology, etc. Author's intention was to compile and compare of various data about these transitional geological environments. Some information were compiled regarding definitions, classifications and such geological features as hydrodynamics, lithodynamics, sedimentary, processes and geochemistry of sediments of estuaries and lagoons.